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Are you speaking of an orafice tube? The factory one is the only one that should need replacement. I do not believe krystal adds a secondary one. Unless of course you have 2 A/C compressors in the vehicle.What year are the base vehicles?

2003, single ac pump, and it is installed in the line for the rear ac system

Could be a pancake filter, located under the hood. I think Manex Corporation supplied Krystal, at least they used to. Google their online catalog. Also, most of the inline stuff is a universal fit, I've got Manex, MTG, and Napa parts all on one AC system.

You can charge your system to specs, system appears to be cycling correctly, but fails miserably at cooling the limo. This problem will drive you absolutely insane trying to figure out or will cost you a pile of money going back and forth to your a/c mechanic. Myself it came down to starting at one point and working your way thru the system. I flushed every part with cleaner from the front to the rear of the limo. Probably took me over 5 months to finally get it figured out between a techs and then finally myself and being really stubborn.

How is the front push fan working. When you turn on the air conditioning system, it should immediately start running.

What's weird this krystal only has one fan (raditor) no secondary. I have replaced compressor, bypassed pancake valve per manex recommendation, expansion valves, filter underhood. Cleaned all lines, new condenser ... I'm so sick of this dsmn limo, I can't figure it out.. It just blows a tad cool will not survive above 80 degrees.. Any ideas?